Got my first 6* esper kill finally, on Leviathan:
Kain -- Impulse Dive, Hurricane Bolt -- GSB+, USB, AASB
Prompto -- Plasma Shock, Tempest Snipe -- GSB+, CSB
Elarra -- Curada, Dispel -- USB1, USB2
Tyro -- Entrust, Wrath -- USB3, AASB
Lightning -- Ripping Plasma, Running Start -- USB1, GSB+...